/*
 *  Copyright (c) 2009, Hugo Augusto Alves
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *      * Redistributions of source code must retain the above copyright
 *        notice, this list of conditions and the following disclaimer.
 *      * Redistributions in binary form must reproduce the above copyright
 *        notice, this list of conditions and the following disclaimer in the
 *        documentation and/or other materials provided with the distribution.
 *      * Neither the name of the Hugo Augusto Alves nor the
 *        names of its contributors may be used to endorse or promote products
 *        derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 *  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
 *  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.wiscriptor.lmldocument;

import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;

/**
 *
 * @author Hugo
 */
public class WDocumentFilter extends DocumentFilter {

    private boolean isSet = false;

    public WDocumentFilter() {
    }

    @Override
    public void insertString(DocumentFilter.FilterBypass fb, int offset, String text, AttributeSet attr) throws BadLocationException {
        AttributeSet a = getAttributeSet(text);
        a = (a == null) ? attr : a;
        fb.insertString(offset, text, a);
    }

    @Override
    public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attr) throws BadLocationException {
        AttributeSet a = getAttributeSet(text);
        a = (a == null) ? attr : a;
        fb.replace(offset, length, text, a);
    }

    // TODO: abrir e fechar com mesmo operador (expandir isSet para isBold, isItalic, etc.)
    private AttributeSet getAttributeSet(String text) {
        if (OldLmlDocument.isOper(text)) {
            isSet = !isSet;
            return WStyles.getInstance().getAttributeSet(OldLmlDocument.tokens.oper);
        } else if(isSet) {
            return WStyles.getInstance().getAttributeSet(OldLmlDocument.tokens.oper);
        } else if(!isSet) {
            return WStyles.getInstance().getDefaultAttributeSet();
        }
        return null;
    }
}
